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<title>元素的层叠顺序？</title>
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层叠顺序，英文称作 stacking order，表示元素发生层叠时有着特定的垂直显示顺序。
<img src="https://camo.githubusercontent.com/210640fbe6e84932323f4549064e1ed1ea37d78408899f83c4d8f552d9725134/68747470733a2f2f636176737a686f75796f752d313235343039333639372e636f732e61702d63686f6e6771696e672e6d7971636c6f75642e636f6d2f6e6f74652d31352e706e67" alt="层叠顺序" data-canonical-src="https://cavszhouyou-1254093697.cos.ap-chongqing.myqcloud.com/note-15.png" style="max-width:100%;">
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